Safety device.



C. F. ROOT SAFETY DEVICE.

APPL ICATION FILED AUG-2| I9l5.

1 1 QMFQQW v Patent-ed Aug. 29, 1916.

6 SHEETS-SHEET l.

C. F. ROOT.

SAFETY DEVICE.

APPLICATION FILED AUG.2, 1915.

1. 1 QHWQQ Patented Aug. 25), 1916.

6 SHEETSSHEET 2.

C. F. ROOT.

SAFETY DEVICE.

APPLICATION FILED AUG.2. I915.

ll; 1 96,2 Patented Aug. 29, 1916.

6 SHEETS-SHEET 3.

C F ROOT.

SAFETY DEVICE.

I APPLICATION FILED AUG.Z| 195- IL ,1 @fifi Patented Aug. 29, 1916.

6 SHEETSSHEET 4 C. F. ROOT.

SAFETY DEVICE.

APPUCATION FILED AUG-2, 915-. LHQUJYQQ, Patented Aug. 29, 1916.

6 SHEETS-SHEET 5.

C. F. ROOT.

I SAFETY DEVICE.

APPLICATION FILED AUG2. l9l5- l 1i W WQQ Patented Aug. 29, 1916.

6 SHEETSSHEET 6.

await CHARLES 1F. ROOT, OF RAVENNA, OHIO, ASSIGNOR 0F. ONE-FOURTH T0 BYRON O. CONN, 0F MANSFIELD, OHIO.

SAFETY DEVICE.

Application filed August 2, 1915.

To all whom it may concern:

Be it known that I, CHARLES F. Roo'r, a citizenof the United States of America, residing at Ravenna, in the county of Portage and State of Ohio, haveinvented certain new and useful Improvements in Safety Devices, of which the following is a specification.

This invention relates to safety devices for machines equipped with a moving element and an opposing element which are adapted to act and eXerta pressure upon work interposed between said elements, the specific construction of the present invention being more particularly applicable for use in connection with the conventional type of job printing presses.

It is well known that the operation of machines of the class described is highly dangerous to the operators because if by reason of inadvertance, accident, mistake or otherwise the operators fail to remove any part of the person from between the elements or interpose any part of the person between the elements upon the pressure movement of the moving element, before such part of the person is forced in contact with both elements and caught therebetween, then and in that event that part of the operators person will be crushed, injured and, maimed by the pressure exerted thereon by the pressure elements.

for performing the work for which they are adapted, economically, efficiently and to their maximum capacity, they must be run or speeded up so as to leave just sufiicient time for the operator to remove from and place the work between the work engaging elements.- It is desirable therefore to pro vide automatic means operable by contact with the hands or engaging elements. It is -desirable therefore to provideautomatic Eli means operable by contact with the hands.

or fingers of the operator to prevent injury thereto which is operable instantly without Specification of Letters Patent.

It is further well known that in the operation of machines Patented Aug, 29, rare.

Serial No. ll-3,149.

the exercise of any mental or physical effort upon the part of the operator. As the capacity or speed of the machine is increased, the liability or danger of the operator of being injured is increased as the operator must interpose his hands or fingers between the work engaging elements oftener and theperiod of time is shortened in which the operator must place the work between and remove his hands and fingers from between the work engaging elements, it is therefore of the utmost importance in the matter of safety of the operator and the capacity of the machine that the safety operating mechanism shall be automatically operable without any physical or mental effort upon the part of the operator in the event of his hands or fingers being caught between the elements, such mechanism permitting the operator to speed up the machine to correspond with the ability of the operator to handle the work without fear of being injured.

. The primary object of this invention is to provide controlling means for automatically controlling, and restricting the movement of the movable work engaging element operable upon contact of the controlling means with the fingers or hands of the operator and so locating, arranging and constructing the controlling means that when the operator fails to remove his hands or fingers from between the elements or by inadvertence, accident or mistake or otherwise the operators hands, or fingers are interposed between the elements, that the controlling means will first contact with the fingers or hands of the operator thereby actuating the safety mechanism to prevent the work engaging element from completing its work ing movement in the direction of the opposing element leaving a pro-determined gap vbetween the elements of sufficient width to A further object is to provide means of interlocking the driving means to the work engaging element for movement in unison and means to actuate the driving means to prevent it from driving the work engaging element to the end of its working stroke without stopping the driving means; said work engaging element being at all times connected to, controlled and governed by the driving means thereby eliminating all jar, vibration, pounding or hammering ,of the parts due to the gravity thereof or because of the actuation of the parts for the purpose intended. I

The above described objects are set out in my application bearing date of May 20, 1915, series of 1915, No. 29389 and the same objects are common and generic to the present invention.

The present invention shows, describes and claims a different means of accomplishing the above described objects and the preferable specific means employed comprise a combined sliding wedge and cam bar which operates in conjunction with a link that is connected to the driving means and to the work engaging element providing a toggle or knee joint therebetween to provide means of forcing the work engaging element to travel to the end of its working stroke under normal conditions and which also is operated to prevent it from traveling tothe end of its working stroke when the controller which is operated to'release suitable mechanism to permit it to connect with and im part movement to the combined sliding Wedge cam bar and toggle link when the controller is subjected to resistance or pressure.

A further object is to provide ameehanism that is automatically operable by a controller to impart a sliding movement to a combined wedge cam bar and similarly and in conjunction therewith a. pivotal movement to a toggle link when the controller is subjected to pressure or resistance (i. 6. contacts with the hand or fingers of the operator); said mechanism" being normally inoperable to impart movement to the com bined sliding wedge, cam bar or toggle link.

Another object is to preferably and pivotally mount the controller upon pivoted standards and to provide means to normally .maintain the controller in the path of the elements'in an intermediate relation thereto andto permit the controller to telescope the platen when the work engaging element acts upon the work.

A further object is to provide means of guiding and sliding the combined wedge cam bar and forcing it to slide to and remain in its operative position until suitable connecting mechanism is actuated by resistance or pressure upon the controller to. automatically impart movement to thecombined wedge cam bar which in turn actuates the toggle link, breaking the knee joint connection between the drivingmeans and work engaging element .thereby preventing the work engaging element from traveling to the end of its working movement.

This invention further consists in the utilization of a cam carried by the driving means of the work engaging element in such a manner as to force it in contact with a rotatable but otherwise non-movable roller and when the controller is manipulated permits the cam to be connectedto the combined sliding wedge cam bar to actuate the toggle link connecting the driving means to the work engaging element thereby breaking the knee joint and preventing the work en* gaging element from completing its working movement.

A further object of this invention is to combine a safety device and a throw-off mechanism in a single means.

Another feature of the presentinvention consists in its ready and easy adaptability and attachment to job presses or the like now in use without any alteration or change thereof.

This invention further consists briefly in the following instrumentalities: a removable and attachable driving means connected to the work engaging element to provide knee joint means to break the joint which is automatically operated when the controlling mechanism is actuated by resistance of pressure-upon the controller; means to maintain the knee joint in locked position under normal conditions; and means to actuate the knee joint mechanism to force it to locked or normal position after being broken because of the resistance or pressure upon the controller.

These and other objects are attained by the mechanism illustrated in. the accompanying drawing, in which:

Figure 1 is a sideelevation of a conventional type of a job press showing the combined safety and throw-off mechanism applied thereto, also showing the position of the parts thereof when the work engaging element is at the end of its idle movement or about to commence its working movement. Fig. 2 is a side elevation of a conventional type of job press showing the combined safety and throw-off mechanism applied thereto, also showing the position of the parts when the work engaging element is at the end of its working movement, exerting or about to exert a pressure upon interposed work. Fig. 3 is a side elevation of a. conventional type of job press showing the combined safety and throw-off mechanism applied thereto, also showing the position of the parts thereof when the controller of the mechanism meets with resistance or is subjected to pressure, 11. e. (as shown in the drawings) when the controller contacts with the fingers or hands of the operator. Fig.4 is a rear elevation of Figs. 1, 2 and 3. Fig. 5 is an enlarged detail side elevation of the full and complete operating mechanism that is mounted upon the driving means. This view represents the mechanism looking at it toward the side thereof that is adjacent to the press, the knee joint and its operating mechanism being shown in this view in their normal position. Fig. 6 is a similar view to Fig. 5 partially in fragment showing the knee joint broken by its actuating mechanism. Fig. 7 is a plan view of Figs. 6 and 7; and Fig. 8 is a side elevation of a portion of the work engaging element with the driving mechanism removed to show more clearly the structure of the controller and its application and connection to the shaft of the work engaging element.

In the drawings, reference numerals" 1 and 2 depict the frame of an ordinary job press, 3 the oscillatingbed or Work engaging element, 4 the oscillating platen, 5 the driving shaft having disks 6 and 7 mounted thereon. The disks 6 and 7 carry the usual crank pins 8 and9 to which oneend of the driving links 10 and 11 are connected. The opposite ends of the links are loosely mounted upon one end of the stud shafts 12 and 13. Toggle links 14 are rigidly secured to the projecting ends of the stud shafts 12 and 13 and are connected to and rigidly The platen 4 is oscillated the roller 18 which isrotatably mounted upon an-arm 19. The armisrigidly fitted to the platen sna ft 20 and the roller engages and travels in the cam race 21, thereby automatically oscillating the platen when movement is imparted to'the disks 6 and 7.

The mechanism for connecting the driving links to the work engaging element are duplicates of each other except a part of the mechanism (preferably on the left side) operating the sliding combined wedge cam bar is preferably dispensed with (as shown in the drawings), the means of connecting one link to the work engaging element therefore, will only be described which is combined, arranged and constructed as follows: An upwardly extending bracket 22 and a downwardly depending bracket 23 are probar 29 thereb slidably supporting one end thereof. The opposite end of the combined wedge and cam bar is provided with a slot 30 Which is alined with and slidably engages a flange headed stud bolt 31 which is threadably fastened to a boss on the cam 24, thereby slidably supporting the opposite end of the connecting wedge cam bar 29.. A boss 32 is formed adjacent to the top of the \cam 24 and a flange headed stud bolt 33 is threadably connected thereon, pivotally supporting and journaling a pawl 34. The pawl is provided with an arm 35 which carries a flange headed pin 36. The upwardly extending bracket 22 is'provided with an elongated horizontal boss 37 upon which a pivotal pawl supporting bar 38 is mounted.

sat

The pawl supporting bar is provided with} a slot 39 which slidably engages the pin 36, thereby normally holding the end 40 of the pawl above the plane" of and in alinement with theseries of ratchet teeth 41 formed inthe upper surface ofthe combined wedge cam bar 29 as will be described hereinafter when discussing the operation of the invention.

Standards 42 and 43 are pivotally mounted on the shaft 4 which is journaled to the frame and which also pivotally supports the work engaging element. A yoke shaped angular controller 45 is pivotally connected to the upper free end of the standards and it carries an elongated cross roller 46. The rearwardly extending angular portions 47 of the yoke are provided with slots 48 which slidably engage the concentric stud portions 15 and 16 of the shaft 17.

The controller is normally held me predetermined position, preferably in advance of the work engaging element, by a spring 49 which exerts its tension to hold the rear wall of the slots formed in the angular arm portions 47 of the yoke in' close contact with the concentric studs of the shaft 17. A horizontally extending locking pin or roller 50 is secured to an arm 51 formed on the pawl supporting bar and is so arranged as to normally lie in contact with a stop pin 64 which is secured to the yoke and through the medium of the pawl supporting bar 'maintains normally and movably holds the end of the pawl above the plane of the ratchet teeth of the combined wedge cam bar.

Upon the usual crossbars 53 and 54, a standard 55 is mounted and carries a rotatable but otherwise stationary roller 56 and it is alined with and arranged in the path of the travel of the cam 24. A horizontally extending roller 57 is secured to the offset portion 58 of the link in the path of the combined wedge cam bar. The cam 24 is held in its normal position by the gravity of the ball. 59 which is secured to the arm 60 of the cam as clearly shown in Fig. 5.

v The cam wedge bar is normally held with its. wedge portion withdrawn from between the roller 57 and pin 27 or in other words in locked position by the tension of the spring (31 which is attached to a link 11 and the downwardly extendin bracket 23. The upright standards 42 anr l 43 are yoked to move in unison by a connecting bar 62. To regulate the locked or dead center position of the'links 14, an ear 63 is provided and extends over and contacts with the top of the link when the dead center position of the link is reached.

The operation and the application of my device in its preferred construction is as follows: Referring now to Figs. 1 and 5, one end of the links 10 and 11, which carry the safety and throw-off mechanism, are connected to the crank pins 8 and 9 and their opposite ends are loosely journaled on the rojeoting ends of the stud shafts 12 an 13 which shafts are rigidly connected to the links 14 and the links in turn are rigidly connected tothe concentric stud portions of shaft 17, thereby connecting the bed 3 to the disks 6 and 7 to impart a reciprocating or oscillating movement to the bed in the direction of the oscillating. platen 4. lVhen the bed, safety and throw-off mechanism are in the positionsshown in Fig. 1, the bed is about to move toward the platen to the end of its .Working movementv and the links 14 are.normally held in locked position by the spring 49 which forces the combined wedge cam bar to its rearward position, withdrawing the wedge portion of the cam bar from between the pin 27 and the roller 57, thereby permitting the bed to complete its working movement and exert a pressure upon 1nterposed work. When the links are reciprocated they carry the face of the cam in contact with the cam roller56, forcing the cam to pivot and the pin 31 to travel back and forth in the slot '30 without in any way affecting the combined wedge cam bar under normal conditions. If no unusual occurrence takes place, which in any way obstructs 0r affects the controller, the work ngaging element will travel (under normal conditions) to the end of its'working movement and exert a pressure upon interposed work, the parts of the combined safety and throw-off mechanism assuming the position shown in Fig. 2. If, however, a pressure is exerted upon, or the controller resisted by, an obstruction as for instance the hand A, or

any part of the person of the operator'should not be removed from between the elements after feeding the work on the platen in time to prevent the hand or any part of the person from being caught between the pressure elements, then and in that event the roller of the controller will first come in contact with the hands or fingers of the person, or any other part of the person, and the controller will be forced to pivot or swing upon its pivotal connection to the standards, thereby forcing the stop pin 64, which is attached to the controller, from its contact with the locking pin or roller 50, permitting the pawl supporting bar 38 to drop by gravity and thereby permit the end 40 of the pawl to mesh with one of the series of ratchet teeth 41 formed on the combined wedge cam bar thereby rigidly connecting the combined wedge cam bar to the cam 24 for movement in unison and whenv the links 10'and 11 are being reciprocated by the disks carrying the crank pins to which one end of the links are connected, the cam 24 is forced in contact with the roller 56 and pressure is exerted upon the face of the cam which in turn forces the wedge portion of the combined wedge cam bar to wedge between the pin 27 and roller 57 imparting movement to the links 14, thereby breaking the knee joints between the links and work engaging element by throwing the center of the stud shafts and center of the concentric portion of the shaft 17 off dead center with reference to each other, thereby preventing the work engaging element from being driven by the links to the end of its working movement. WVhen the wedge portion of the combined wedge cam bar breaks the knee joint, it is further broken by the continued pressure of the cam portion 65 against the roller 57, as shown in Fig. 6. When the pressure or resistance upon the controller is released or relieved,-it swings to its normal position which brings the stop pin 64 in contact with the locking roller 50 which supports the pawl supporting bar to maintain the end 40 of the pawl over the plane of the ratchet teeth.

The engagement and disengagement of the pawl with the ratchet teeth for the purpose of .operatively connecting the combined safety and throw-off mechanism for the purpose intended under abnormal conditions, and permitting it to remain in operative position, is accomplished automatically Without in any way affecting the movement of the driving means or other mechanism except as to governor regulate the travel of the work engaging element to leave a predetermined gap between the opposing elements when the controller meets resistance or an obstruction, as hereinbefore described.

Attention is called to the fact that the controller is formed to telescope the platen when the work engaging element is acting upon the work as shown in Fig. 2 and the roller 13 niee aa 46 which is used for a contact member extends alcove the bed, as shown in Fig. 4. As the complete safety and throw-ofi mechanism, except the contact roller 56, is mounted upon the driving means, a self containing safety and throw-off mechanism is provided that can be applied to job presses now in use without alteration by simply taking off the standard links and replacing them with the links to which the safety and throw-off mechanism is applied, as herein described,

and mounting thestandard carrying/the roller 56 on the cross shafts which are already :1 part of the com'entional type of job presses. Attention is further called to the fact that on account of the wedging function. of the combined wedge cam bar, the knee joint is broken instantly and contempow raneouslyv with the engagement of the pawl with the combined cam wedge bar, thereby immediately afiording safety and stopping the further movement of the work engaging element in the direction of the platen (until the obstruction or resistance to the con troller is eliminated) leaving the safety gap hereby referred to or throwing off the impression of the type upon the paper at the will of the operator.

What is claimed is: g

1. In a combined safety and throw-ofi' mechanism in combination with a movable work engaging element, driving means, means to. connect the driving means to the work engaging element to normally force the work engaging element to travel to the endof its working movement, a combined Wedge cam bar slidably mounted on the driving means, a controller, means operabfe when the controller is subjected to pressure or resistance to actuate the connecting wedge cam bar to prevent the driving means from driving the work engaging element to the end of its working movement.

2. In a combined safety and throw-off mechanism in combination with a movable work engaging element and an opposing element, comprising a driving means, knee joint mechanism to connect the driving means to the work engaging element to force it to travel to the end of its working movement under normal conditions, a controller pivotally mounted between the opposing elements, a'sliding wedge cam bar mounted on the driving means, and means to permit automatic actuation of the sliding cam wedge bar to prevent the work engaging element from traveling tothe end of its working movement when the controller is subjected to pressure or meets an obstruction. a v v 3. in a combined safety and throw-0d mechanism for machines having a movable work engaging element, driving means, links to connect the driving means to the work engaging element to form a knee joint therebetween, means to normally retain the knee joint connection on dead center for driving the work engaging element tothe end of its working movement, a controller, a sliding wedge cam bar mounted on the driving means a cam carried by the driving means, a stationary roller arranged in the path of the cam and adapted to contact therewith and actuate the sliding wedge cam bar when the controller is resisted thereby permitting the cam wedge bar to connect with the cam and exert a pressure on the links forcing the knee joint oii' center, thereby preventing the driving means from forcing the work engaging element to travel to the end of its Working stroke leavmg a safety gap between the opposing elements.

4:. In combination with a pair of work engaging elements adapted to operate upon work interposed therebetween, one of said elements being movable toward the other, driving means connected to the movable element to drive it in unison therewithand to permit independent movement thereof, a combined sliding wedge cam bar mounted upon the driving means, means to autoa combined sliding wedge cam bar mounted upon the driving means, means to automatically operate the combined wedge cam bar to prevent the driving means from forcing the work engaging element to travel to the end of its working. movement, a cam pivotally mounted on the driving means, a

' roller arranged in the path of the cam to contact therewith and to actuate the combined sliding wedge cam bar.

6. In combination with a pair of work engaging elements adapted to operate upon work placed therebetween, driving means, a kneejoint member to connect one of the elements to the driving means, means to' actuate the knee joint member to force the element to which it is connected to travel to the end of its working movement, a controller pivotally mounted between the elements, mechanism operated by pressure on the controller to prevent the element from' being'driven to the end of its working movement, thereby leaving a safety gap between the elements to prevent injury to the person of the operator.

7. In a safety mechanism equipped with cooperative pressure elements, one being adapted to move toward the other, driving means yieldingly connected to the movable element, a sliding combined wedge cam bar mounted upon the driving means, a cam pivotally mounted on the driving means, a contact roller arranged in the path of the cam, a controller pivotally mounted in a pro-determined point in the path of the elements, and a connecting mechanism to automatically actuate the combined wedge cam bar when the controller is resisted or subjected to pressure.

8. In a safety mechanism for machines equipped with pressure applying elements, one of the elements being movable toward the other, dri ing means yieldingly connected to the movable element and normally movably locked thereto to drive the movable element in unison therewith, a combined wedge cam bar slidably mounted on the driving means, a controller and mechanism connected to the combined sliding wedge cam bar which is automatically actuated by pressure or resistance upon the controller to prevent the driving means through the medium of the combined wedge cam bar, from driving the movable element to the end of its working movement. I

9. In a safety mechanism for machines equipped with pressure applying elements, one of the elements being movable toward the other, driving means yieldingly connected tothe movable element and normally movably locked thereto to drive the movable element in unison therewith, a combined wedge cam bar slidably mounted on the driving means, a controller and mechanism connected to the combined sliding wedge cam bar which is automatically actuated by pressure or resistance upon the controller to prevent the driving'means, through the medium of the combined wedge cam bar, from driving the movable element to the end of its working movement, said mechanism being also operable by hand manipulation of the controller to prevent the movable element from completing its stroke, thereby preventing impression of the type upon the paper and at the same time leaving a safety gap between the elements.

10. In combination with a pair of work engaging elements adapted to operate upon work placed therebetween, driving means, means to yieldingly connect the driving means to one of the elements for movement) in unison under normal conditions, a sliding wedge cam bar mounted on the driving means. and adapted to co-act with the yieldi'ng connecting means to restrict and prevent movement of the movable element in unison with the driving means.

11. In a combined safety and throw-off mechanism for printing presses and analogous machines, in combination with cotiperating pressure elements, means to -reciprocate one of the elements to drive it to the end of its working movement under normal conditions, means to prevent the driving means from driving the reciprocating element to the end of its working movement under abnormal conditions, comprising a controller, a combined wedge cam bar. means to actuate the combined \vedge cam bar by resistance to the controller to automatically prevent the driving means from driving the movable element to the end of its working movement until said resistance is eliminated.

12. In a safety mechanism equipped with cooperating pressure elements, driving links, links connecting one of the pressure elements to the drivinglink for reciprocation and to force it in juxtapostion withthe opposing element, under normal conditions, a sliding wedge cam bar mounted on one of the driving links, a cam also pivotally mounted on the aforenamed link, a contact roller arranged in the path of the cam to impart movement to the cam, a controller operable by pressure to permit the cam to connect with the sliding wedge cam bar and impart movement thereto and by a \vedging and cam action force the connecting links to pivot and thereby prevent the movable element from being forced to travel to the end of its working movement without affecting or stopping the movement of the driving links.

13. In a safetymechanism for machines equipped with pressure applyin members, one of the members being mova le toward the other, driving means, a knee joint mechanism to connect the driving means to the movable element for movement in unison and to permit of idle movement with respect to the driving means, a sliding wedge cam bar to actuate the knee joint mechanism.

14. In a safety mechanism for machines equipped with pressure applying members, one of the members being movable toward the other, driving means, a knee joint mechanism to connect the, driving means to the movable element for movementin unison and to permit of idle movement with respect to the driving means, a sliding wedge cam bar toactuate the knee joint mechanism, a controller; said sliding wedge cam bar being. automatically, or by hand manipulation, operable by pressure upon the controller to regulate and govern the travel of the movable element to prevent the movable element from traveling to the end of its working. movement thereby leaving a gap between the elements.

15. In a safety mechanism equipped with cooperating pressure members, driving links, a knee joint mechanism to connect the driving links to one of the pressure members for reciprocation thereof toward and in juxtaposition with the opposing element, a stationary roller, means to manipulate the knee joint on to dead center P.l1[l 'lb0l(d position, a combined sliding wedgecam bar "mounted upon the link, a cam mounted on the link and adapted to be connected to the combined sliding wedge bar and also contact with the aforesaid roller to impart movement to the combined wedge cam bar to unlock and throw the knee joint ott' center.

16. In a safety mechanism for machines equipped with cooperating pressure members. driving means yieldably connected to one member for the reciprocation'thereof, a controller located in the path of the pres sure members. mechanism carried by the driving means comprising a combined sliding wedge cam bar and a cam for actuating the same, a stationary contact roller arranged in the path of the cam to co-act therewith to impart movement to the combined sliding wedge cam bar to prevent the yieldable driving means from driving the movable member to the end of its working movement when the controller is subjected to pressure.

17. A combined safety and throw-oft mechanism for machines equipped with a movable work engaging element and an opposing element, driving means, links connected to the driving means to the work en gaging element forming a knee joint, mechanism carried by the driving means to throw the connecting link off or on dead center breaking the knee joint under abnormal conditions and maintainin the joint locked 85 under normal conditions, thereby restricting the travel of. the work engaging element toward the opposing element to leave a safety gap between the elements. I

18. A combined safety and 'throw-ofl' 40 mechanism for machinesequipped with a movable work engaging element and an opposing element, driving means, links connected to the driving means to the work engaging element forming a knee joint, mecht5 amsm carried by the driving means to throw the connecting link ofi or on dead center breaking the knee joint under abnormal conditions and maintaining the joint locked under normal conditions, thereby restricting the travel of the work engaging element toward the opposing element to leave a safetygap between the elements or forcing conditions and maintaining the joint locked under normal conditions, thereby restricting the travelof the work engaging element toward the opposing element to leave a safetygap between the elements or forcing the work engaging element to travel to the end of its working stroke, a controller pivotally mounted between the elements and slidably connected to the connecting shaft of the work engaging element and operatively engaging the mechanism carried by the driving m ans, a contact roller arranged in the path of the mechanism carried by the driving means which is adapted to contact with and operatively engage the mechanism when the controller is subjected to pressure.

20. In a combined safety and throw-off mechanism, cooperating pressure elements, one movable toward the other, driving means yieldably connecting the movable pressure element to. normally move it to pressure position to exert a pressure upon workinterposed between the elements. a controller. means to actuate the driving means to preventthe movable element from being driven thereby to the end of its normal movement which has the effect of leaving a safety zone between the elements and to throw oil the impression of the type on the platen, a stationary contact roller; said mechanism being carried by the driving means "and adapted to contact with said rollerwvhen the controller is subjected to pressure.

In testimony whereof I attix my signature in presence of two witnesses.

CHARLES F. ROOT.

Witnesses;

JOHN H. Coss, PEARL M. YUNCHER. 

